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In part two of last week's Season 8 premiere, Beckett's side of her abrupt disappearance is revealed.

Source: ABC

When the body of a local college fraternity student is found gruesomely murdered, Castle has to go undercover as a professor in order to gain access to the victim's world. However, he and Beckett soon discover that behind the fun and games of college are some darker secrets the university wants to keep hidden.

Source: ABC

When Castle's idol, a famously reclusive author, turns up dead, Castle is determined to solve his hero's murder. But as he and Beckett dig deeper, they discover that truth is stranger than fiction.

Source: ABC

When a priceless work of art is stolen and its transporter murdered, Castle and Beckett must work with the key witness to track down the painting and sniff out the killer.

Source: ABC

Detective Slaughter (guest star Adam Baldwin) returns to enlist Castle's help in solving a high-stakes robbery case.

Source: ABC

In order to hunt down the brutal murderer of a grifting seducer, Castle & Beckett must investigate New York's elite. Meanwhile, Castle plans to surprise Beckett on their one-year wedding anniversary.

Source: ABC

Castle and Beckett investigate the murder of a cruise ship entertainer, only to find themselves trapped at sea with the killer.

Source: ABC

After a corpse is found in the theater of Martha's latest show, Castle and Beckett's investigation comes up with some surprising facts about the world of competitive a capella.

After Castle takes the stand as the main witness to a murder some new information suddenly arises, forcing Beckett to try and prevent a miscarriage of justice.

The son of a Russian diplomat is found dead. During the investigation, Castle entertains a jovial Russian security guard, who ends up being more involved in the case than expected.

Castle ends up being abducted and is forced to solve deranged puzzles and mind games with other strangers. Beckett and the 12th precinct attempt to save him.

After a student who takes English as a second language is found dead, Castle goes under cover and finds out some unexpected information about him.

Castle makes his way to Los Angeles looking for finding answers about the time he cannot remember. He ends up in danger though after he is recruited by the Greatest Detective Society.

Beckett and the team make their way back to the NYPD academy training ground to find out about the murder of a recruit officer.